All of csl.orgMixed2 tested URLs
Can you open http://csl.org from mainland China?
Sometimes.
Access is unreliable — 100% of the last 1 conclusive tests showed interference.
Access csl.org with GreatFireVPN →2014first tested
1/1disrupted · last 90 days
2 mo agolast tested
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Frequently asked questions
Is http://csl.org blocked in mainland China right now?
As of the last test on 2026-06-12, http://csl.org is 100% disrupted in mainland China, based on GreatFire's live Great Firewall measurements.
Why is http://csl.org blocked in mainland China?
Access is unreliable — 100% of the last 1 conclusive tests showed interference.
Since when has http://csl.org been blocked?
GreatFire has recorded interference with http://csl.org from mainland China since 2014-05-11.
How can I access http://csl.org from mainland China?
You need a circumvention tool such as a VPN. GreatFireVPN, built by GreatFire, is designed to bypass the Great Firewall and reach sites like csl.org.
http://csl.org · JSON